Recording medium driving device

ABSTRACT

Provided are a disc guide mechanism  41  that is disposed on one end side of a slot  10 A in a drive unit body  10  and guides an optical disc  1 ; and a disc diameter detecting mechanism  42  that is disposed on the other side of the slot  10 A in the drive unit body  10  and retracts the disc guide mechanism  41  when the optical disc  1  inserted in the slot  10 A is large and advances the optical disc  1  when the optical disc  1  is small. The disc guide mechanism  41  and the disc diameter detecting mechanism  42  which are respectively disposed on sides of the slot  10 A can center the optical disc  1  in accordance with a diameter of the optical disc  1.

TECHNICAL FIELD

The present invention relates to a recording medium drive equipped witha slot that is provided to a drive unit body and allows insertion andejection of a disc-like recording medium; and a driving section that isprovided substantially at a center portion in the drive unit body androtates the disc-like recording medium.

BACKGROUND ART

As a recording medium drive of the type, there has been known aso-called slot-in type disc drive that automatically transfers adisc-like recording medium to a predetermined position when thedisc-like recording medium is inserted to a predetermined position by auser.

Some disc drives of this type can be used for both of a 12 cm disc-likerecording medium and an 8 cm disc-like recording medium.

As an example of related disc drives that can be used for two types ofdisc-like recording media having different diameters, there is a discreproducing device equipped with a transport roller for inserting a discalong a disc insertion opening; and central, right and left sensorsprovided in the vicinity of the transport roller for judging a diameterof the disc (Patent Document 1).

According to Patent Document 1, the transport roller transfers the discto a predetermined position while abutting and sliding on a flat portionof the disc. After the three types of sensors judge the diameter of thedisc, the disc is positioned at a predetermined position by apositioning mechanism that has a positioning pin provided on a rear sideof the device.

[Patent Document 1] JP-A-H02-118955 (see pages 3 and 4 and FIGS. 1 and2)

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

This slot-in type disc drive includes a thin type. The thin type discdrive has been used for a 12 cm disc. Currently there is no thin typedisc drive that can be used for both of a 12 cm disc and an 8 cm disc.

It may be conceived to employ the arrangement of Patent Document 1 forthe thin type disc drive. However, since the invention disclosed inPatent Document 1 were not made with a thin type disc drive in mind, itis not possible to employ the arrangement as it is for a thin type discdrive.

Specifically, the transport roller of Patent Document 1 is disposed at aposition to face a flat surface of the disc, so that downsizing inthickness is limited, which may be one problem to be solved.

Additionally, since the three types of sensors (the center, right andleft sensors) are provided, spaces for these sensors are necessary,which may limit the downsizing in thickness of the disc drive. This maybe another problem to be solved.

An object of the present invention is to provide a recording mediumdrive that can be used for disc-like recording media having differentdiameters and contribute to downsizing in thickness.

Means for Solving the Problems

A recording medium drive according to the present invention includes: adrive unit body having a slot for insertion and ejection of a disc-likerecording medium; a driving portion that is provided in the drive unitbody and rotates the disc-like recording medium; a disc guide mechanismthat is provided on one end side of the slot and guides the disc-likerecording medium; and a disc diameter detecting mechanism that isconnected with the disc guide mechanism and moves the disc guidemechanism in accordance with a diameter of the disc-like recordingmedium. The disc guide mechanism is disposed on the end side of the slotand biased toward the opposite end side. The disc detecting mechanismretracts the disc guide mechanism toward the one end side when thedisc-like recording medium having a large diameter is inserted in theslot.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a plan view schematically showing a recording medium drive ofan embodiment of the present invention;

FIG. 2A is a schematic illustration showing a relationship between ananti-rotation link and a first link, FIG. 2A showing a state in whichthe first link is right before an interference with the anti-rotationlink;

FIG. 2B is a schematic illustration showing the relationship between theanti-rotation link and the first link, FIG. 2B showing a state in whichthe first link has just begun to interfere with the anti-rotation link;

FIG. 3 is a plan view showing in detail a structure of a cam groove;

FIG. 4 is an illustration corresponding to FIG. 1, the illustrationexplaining a first operation of the aforesaid embodiment in which alarge optical disc is set;

FIG. 5 is an illustration corresponding to FIG. 1, the illustrationexplaining the first operation of the aforesaid embodiment;

FIG. 6 is an illustration corresponding to FIG. 1, the illustrationexplaining the first operation of the aforesaid embodiment;

FIG. 7 is an illustration corresponding to FIG. 1, the illustrationexplaining the first operation of the aforesaid embodiment;

FIG. 8 is an illustration corresponding to FIG. 1, the illustrationexplaining the first operation of the aforesaid embodiment;

FIG. 9 is an illustration corresponding to FIG. 1, the illustrationexplaining the first operation of the aforesaid embodiment;

FIG. 10 is an illustration corresponding to FIG. 1, the illustrationexplaining a second operation of the aforesaid embodiment in which asmall optical disc is set;

FIG. 11 is an illustration corresponding to FIG. 1, the illustrationexplaining the second operation of the aforesaid embodiment;

FIG. 12 is an illustration corresponding to FIG. 1, the illustrationexplaining the second operation of the aforesaid embodiment;

FIG. 13 is an illustration corresponding to FIG. 1, the illustrationexplaining the second operation of the aforesaid embodiment; and

FIG. 14 is an illustration corresponding to FIG. 1, the illustrationexplaining the second operation of the aforesaid embodiment.

EXPLANATION OF CODES

1: optical disc (disc-like recording medium)

10: drive unit body

10A: slot

23: turntable (driving section)

41: disc guide mechanism (second disc feeding mechanism)

41A: abutting portion

411: first link

412: second link

42: disc diameter detecting mechanism

421: arm

421A: abutting portion

421B: guide groove

422: arm link mechanism

423: connecting member

423A: projection

424: anti-rotation link

424A: stopper

43: disc ejecting mechanism

44: first drive cam

45: second drive cam

50: disc feeding mechanism

51: disc feeding cam portion

52: projection

53: cam groove

53A: first cam groove

53B: second cam groove

53C: common cam groove

53D: curved portion

60: disc ejecting mechanism

61: first disc feeding mechanism

61A: abutting portion

611, 612: eject arm

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below withreference to the attached drawings.

In this embodiment, a disc recording medium may be read-only orwrite-only. The disc recording medium may not be limited to an opticaldisc, but may be any type of disc recording medium such as a magnet discand a magnetooptical disc. In the embodiment, a thin slot-in type discdrive installed in an electric appliance such as a portable personalcomputer is exemplified. However, the disc drive may have a stand-aloneconfiguration like a game console or a reproducing device for recordingand reproducing video data.

(Arrangement of Disc Device)

In FIG. 1, a recording medium drive of the embodiment is a so-calledthin slot-in type disc drive installed in an electric appliance such asa portable personal computer. The disc drive performs informationprocessing including reading processing in which information recorded ona recording surface (not shown) provided on at least one surface of adiscoidal optical disc 1 (a disc-like recording medium) detachablyattached to the disc drive; and recording processing in whichinformation is recorded on the recording surface.

The disc drive includes a drive unit body 10. For example, the driveunit body 10 may be made of metal and have a substantially box-likeshape and an inner space.

Inside the drive unit body 10, a disc processing portion 20 (a so-calledtraverse mechanism), a transfer unit 30 that transfers the optical disc1 and a control circuit (not shown) are provided. On a front side of thedrive unit body 10, a slot 10A for inserting and ejecting the opticaldisc 1 extends in the right to left direction in FIG. 1.

The disc processing portion 20 includes a base 21. For example, the base21 may be made of metal and have a substantially plate-like shape ofwhich one end is swingably supported by the drive unit body 10.

The base 21 is provided with a disc rotation driver 22 disposed on oneend side in a longitudinal direction of the base 21 (i.e. disposed inthe vicinity of a peripheral end portion of the base 21). The discrotation driver 22 includes a spindle motor (not shown) and a turntable23 integrally formed on an output shaft of the spindle motor. Thespindle motor is controllably connected to the control circuit. Thespindle motor is driven by electricity supplied from the controlcircuit.

The turntable 23 is a driving section provided substantially at a centerportion in the drive unit body 10. The turntable 23 rotates the opticaldisc 1.

The base 21 is provided with an information processing section (notshown). The information processing section is supported like a bridgeover a pair of guide shafts (not shown). A moving mechanism (not shown)moves the information processing section toward and away from theturntable 23.

The information processing section is provided with a pickup having alight source, a lens that converges light from the light source and anoptical sensor (not shown) that detects output light reflected by theoptical disc 1.

A cover 21A is integrally attached to the base 21. The cover 21A isprovided with a longitudinal processing opening 21B substantially at acenter portion of the cover 21A. The processing opening 21B is formed asa cutout extending along the longitudinal direction of the base 21. Theprocessing opening 21B is positioned so as to correspond to a movingpath of the pickup and a position of the turntable 23.

The transfer unit 30 includes a transfer motor (not shown) that isprovided to the drive unit body 10 and driven by, for example, thecontrol circuit; and a link mechanism 31 that interlocks in accordancewith the drive of the transfer motor.

The link mechanism 31 includes a disc guide mechanism 41, a discdiameter detecting mechanism 42, a disc ejecting mechanism 43, a firstdrive cam 44 and a second drive cam 45. The disc guide mechanism 41 isprovided on one end side of the slot 10A in the drive unit body 10 (theleft side in FIG. 1). The disc diameter detecting mechanism 42 isprovided on the other end side of the slot 10A in the drive unit body 10(the right side in FIG. 1). The disc ejecting mechanism 43 ejects theoptical disc 1 disposed on the turntable 23. The first and second drivecams 44 and 45 swing the base 21.

The first and second drive cams 44 and 45 are each provided with anengagement projection. The engagement projections are respectivelyengaged with cam grooves (not shown) formed in two lateral surfaces ofthe base 21. The first and second drive cams 44 and 45 are formed in asubstantially elongate shape and are advanced and retracted along thelongitudinal direction by a motor and a gear mechanism (both not shown).Thereby, the base 21 is swung so as to move toward and away from therecording surface of the optical disc 1 mounted on the turntable 23.

The disc guide mechanism 41 is provided with two first links 411 with apredetermined distance therebetween and a second link 412. Each of thefirst links 411 is rotatably supported by the drive unit body 10 at oneend. The second link 412 connects the other ends of the first links 411.The disc guide mechanism 41 is a parallel link that enables advancementand retraction of the optical disc 1 toward and away from the other endside of the slot 10A (the right side in FIG. 1).

The first links 411 and the second link 412 are disposed in a planeorthogonal to a rotation axis of the turntable 23.

One of the two first links 411 is disposed on the slot 10A side. Theother first link is disposed on a rear side. The first link on the rearside is provided with a pin 411A that can move along an arc-shaped guideportion 10B formed on the drive unit body 10.

The first links 411 are parallel to each other and connected with thesecond link 412 at positions that are away by a common distance fromrespective supporting points. Accordingly, the second link 412 isadapted to move toward and away from the turntable 23.

A spring (not shown) is provided between one of the two first links 411and the drive unit body 10. Due to the spring force, the first link 411constantly rotates clockwise and the second link 412 is constantlybiased toward the turntable 23.

Provided in the vicinity of a connecting portion of the first link 411disposed on the slot 10A side and the second link 412 is an abuttingportion 41A abutting to a peripheral portion of the optical disc 1.

The disc diameter detecting mechanism 42 causes the disc guide mechanism41 to retract when the optical disc 1 inserted in the slot 10A is afirst disc-like recording medium having a large diameter and to advancewhen the optical disc 1 is a second disc-like recording medium having asmaller diameter than that of the first disc-like recording medium.

Specifically, the disc diameter detecting mechanism 42 is provided withan arm 421 and an arm link mechanism 422 connected with the arm 421. Oneend portion of the arm 421 abuts to the optical disc 1. The other endportion of the arm 421 is rotatable relative to the drive unit body 10.The arm link mechanism 422 allows the disc guide mechanism 41 to retractwhen a rotation angle of the arm 421 is large and prevents the discguide mechanism 41 from retracting when the rotation angle of the arm421 is small.

Provided to one end of the arm 421 is a roller-like abutting portion421A that abuts to a peripheral portion of the optical disc 1. The otherend is rotatably supported by the drive unit body 10. The arm 421 ismade with a plate member having a narrow elongate rectangular shape.Along a longitudinal direction of the arm 421, a guide groove 421B isformed.

The arm link mechanism 422 is provided with a connecting member 423 in asubstantially flat plate shape and an anti-rotation link 424 in asubstantially flat plate shape. A projection 423A guided along the guidegroove 421B is provided at one end of the connecting member 423. One endof the anti-rotation link 424 is connected with the connecting member423.

The arm 421 and the connecting member 423 are disposed at positionsopposite to the disc guide mechanism 41 with the turntable 23 interposedand are disposed substantially in the same plane as the disc guidemechanism 41.

The other end of the connecting member 423 is supported so as to berotatable relative to a rotary shaft 423B fixed to the drive unit body10. The connecting member 423 is provided with an engagement portion423C at a position opposite to the projection 423A with the rotary shaft423B interposed.

The anti-rotation link 424 is provided on a rear side relative to theturntable 23 so as to be movable in the right to left direction in thefigure. A right end of the anti-rotation link 424 is engageable with theengagement portion 423C. Provided on a left end of the anti-rotationlink 424 is a stopper 424A that can abut to a pin 411A of the first link411.

When the anti-rotation link 424 is positioned on the left side of thefigures, the stopper 424A is positioned on a movement locus along theguide portion 10B of the pin 411 A of the first link 411 (FIGS. 2A and2B). When the anti-rotation link 424 is positioned on the right side ofthe figures, the stopper 424A is positioned at a position deviated fromthe movement locus of the pin 411A of the first link 411.

Hence, in the embodiment, when the optical disc 1 of a large diameter(for example, 12 cm) is inserted from the slot 10A, the optical disc 1presses the arm 421 to cause a large counterclockwise rotation of thearm 421 and accordingly a large counterclockwise rotation of theconnecting member 423 (see FIG. 4). The large rotation of the connectingmember 423 moves the anti-rotation link 424 to the right side in FIG. 1to cause the stopper 424A to be deviated from the movement locus of thepin 411A, thereby allowing a retraction of the disc guide mechanism 41(see FIG. 5).

On the other hand, when the optical disc 1 of a small diameter (forexample, 8 cm) is inserted, the optical disc 1 presses the arm 421 tocause a small counterclockwise rotation of the arm 421 and accordingly asmall counterclockwise rotation of the connecting member 423. Even whenthe connecting member 423 is rotated, since the rotation amount issmall, the anti-rotation link 424 remains on the left side in FIG. 1 andthe stopper 424A remains on the movement locus of the pin 411 A (seeFIG. 10). When the optical disc 1 is inserted further from such a state,the second link 412 moves to a predetermined position in a directionaway from the turntable 23 (i.e. the disc guide mechanism 41 isretracted) as shown in FIG. 2A. When the second link 412 reaches thepredetermined position, the pin 411A abuts to the stopper 424A and thesecond link 412 is prevented from moving as shown in FIG. 2B.

Referring to FIG. 1, in the embodiment, a disc feeding mechanism 50 isprovided with the arm 421, the connecting member 423, the first drivecam 44 that is connected with the other end of the connecting member 423and advances and retracts the connecting member 423, and a switch thatdetects that the optical disc 1 is inserted from the slot 10A to apredetermined position. The switch is provided with later-describedeject arms 611 and 612. When the inserted optical disc 1 rotates theeject arms 611 and 612, the first drive cam 44 is advanced.

When the disc feeding mechanism 50 detects with the switch that theoptical disc 1 is inserted to the predetermined position, the arm 421inserts the optical disc 1 to a rear side such that the optical disc 1is fed to the turntable 23.

The connecting member 423 and the first drive cam 44 are provided with adisc feeding cam portion 51 that reduces a feeding amount of the opticaldisc 1 for feeding the optical disc 1 to the turntable 23 when theoptical disc 1 is large and increases the feeding amount of the opticaldisc 1 for feeding the optical disc 1 to the turntable 23 when theoptical disc 1 is small.

The disc feeding cam portion 51 is provided with a projection 52disposed on the connecting member 423 and a can groove 53 engaged withthe projection 52 and formed in the first drive cam 44.

In FIG. 3, the cam groove 53 is provided with a first cam groove 53Athat feeds the optical disc 1 of a large diameter, a second cam groove53B that feeds the optical disc 1 of a small diameter and a common camgroove 53C. On one end of the common cam groove 53C, the first andsecond cam grooves 53A and 53B join together.

The first cam groove 53A and the second cam groove 53B are formed so asto extend in the moving direction of the first drive cam 44. The secondcam groove 53B has a longer path than the first cam groove 53A, therebychanging the rotation amount of the arm 421.

The first cam groove 53A and the second cam groove 53B are each providedwith a curved portion 53D on the other end side. When the projection 52is guided to the curved portion 53D, the arm 421 is spaced from theoptical disc 1 via the connecting member 423. In the embodiment, whenthe turntable 23 rotates, the first drive cam 44 is at the most advancedposition, where the projection 52 is guided to the curved portion 53D ofthe first cam groove 53A or the curved portion 53D of the second camgroove 53B, so that the optical disc 1 is spaced from the disc feedingmechanism 50. Similarly, when the turntable 23 rotates, the disc guidemechanism 41 is at the most retracted position so as to be spaced fromthe optical disc 1.

Referring to FIG. 1, the disc ejecting mechanism 43 is provided with afirst disc feeding mechanism 61 disposed on a rear side in the driveunit body 10; and a second disc feeding mechanism that feeds the opticaldisc 1 fed by the first disc feeding mechanism 61 to the slot 10A, thesecond disc feeding mechanism positioned on the slot side relative tothe first disc feeding mechanism 61. In the embodiment, the second discfeeding mechanism is the disc guide mechanism 41.

The first disc feeding mechanism 61 is provided with the pair of ejectarms 611 and 612. One end of each eject arm 611, 612 is rotatablysupported in the drive unit body 10 via a rotary shaft 613. The ejectarms 611 and 612 are rotated in accordance with advancement andretraction of the first and second drive cams 44 and 45.

The eject arms 611 and 612 are disposed with the turntable 23 interposedso as to hold a peripheral portion of the optical disc 1. Provided on atip end of each eject arm 611, 612 is a roller-like abutting portion 61Athat abuts the peripheral portion of the optical disc 1.

Between the eject arms 62 and 63 and the first and second drive cams 44and 45, a cam mechanism is provided such that the eject arms 611 and 612are operated in a predetermined manner as the first and second drivecams 44 and 45 are advanced and retracted.

The cam mechanism allows the tip ends of the eject arms 611 and 612 tobe released when the optical disc 1 is inserted from the slot 10A andspaces the tip ends from the optical disc 1 by positioning the tip endsat the most released positions when the turntable 23 rotates.

Since the disc guide mechanism 41 has a structure in which the firstlink 411 on the slot 10A side rotates clockwise, the abutting portion41A functions as the second disc feeding mechanism by pressing theperipheral portion of the optical disc 1.

The anti-rotation link 424 is provided with a groove or a cutout formedat appropriate positions such that the anti-rotation link 424 does notinterfere with the eject arms 611 and 612.

(Operation of Disc Drive)

An operation of the disc drive according to the embodiment will bedescribed.

With reference to FIGS. 4 to 9, an operation to insert and eject theoptical disc 1 having a large diameter (12 cm) into and from the discdrive will be described.

When a user manually inserts the optical disc 1 having the largediameter from the slot 10A into the disc drive as shown in FIG. 1, theperipheral portion of the optical disc 1 causes a large rotation of theabutting portion 421A of the arm 421 of the disc diameter detectingmechanism 42 and presses the abutting portion 41A of the disc guidemechanism 41. Thereby, the arm 421 and the connecting member 423 makelarge rotations, the projection 52 of the connecting member 423positioned on the common cam groove 53C of the first drive cam 44 movesto the first cam groove 53A side. Additionally, since the connectingmember 423 makes the large rotation, the anti-rotation link 424 movestoward the right side in the figure. Accordingly, the stopper 424Aprovided on the left end of the anti-rotation link 424 becomes deviatedfrom the movement locus of the pin 411A of the disc guide mechanism 41.

As shown in FIG. 5, when the optical disc 1 is further inserted, thedisc guide mechanism 41 is deformed, the second link 412 greatlyretracts from the turntable 23, so that the optical disc 1 having thelarge diameter can be inserted into the drive. The peripheral portion ofthe optical disc 1 abuts to the abutting portions 61A of the eject arms611 and 612.

As shown in FIG. 6, when the optical disc 1 is further inserted, theabutting portions 61A of the eject arms 611 and 612 are spaced from eachother to hold the optical disc 1. When more than the half of the opticaldisc 1 has been inserted in the drive, a switch (not shown) operates inaccordance with the rotations of the eject arms 611 and 612. Inaccordance with the operation of the switch, the disc feeding mechanism50 operates.

Accordingly, the first drive cam 44 advances and the projection 52 movesalong the first cam groove 53A formed in the first drive cam 44.Thereby, the connecting member 423 provided with the projection 52rotates clockwise, and accordingly the arm 421 rotates clockwise toinsert the optical disc 1 to the turntable 23. As shown in FIG. 7, thearm 421 rotates until the center of the optical disc 1 is positioned onthe turntable 23.

As shown in FIG. 8, when the arm 421 inserts the optical disc 1 to theturntable 23, the projection 52 is guided to the curved portion 53Dformed on the end of the first cam groove 53A and the arm 421 rotates inthe reverse direction, so that the abutting portion 421A is spaced fromthe peripheral portion of the optical disc 1. In addition, the ejectarms 611 and 612 and the disc guide mechanism 41 are also spaced fromthe optical disc 1 so as not to prevent the rotation of the optical disc1.

When the center of the optical disc 1 is positioned on the turntable 23,the movement of the first and second drive cams 44 and 45 causes thebase 21 to move closer to the recording surface of the optical disc 1and the optical disc 1 is clamped to the turntable 23. In this state,the turntable 23 rotates and information is recorded on and/orreproduced from the optical disc 1.

To eject the optical disc 1 from the disc drive, the first and seconddrive cams 44 and 45 are moved in a reverse direction of theabove-described direction such that the base 21 is spaced from therecording surface of the optical disc 1.

The first disc feeding mechanism 61 is operated. Accordingly, the ejectarms 611 and 612 are rotated to eject the peripheral portion of theoptical disc 1 toward the slot 10A. In this state, the disc guidemechanism 41 is retracted from the turntable 23 and the abutting portion421A of the arm 421 is kept rotated greatly.

As shown in FIG. 9, when substantially more than the half of the opticaldisc 1 is ejected by the eject arms 611 and 612 from the slot 10A, theeject arms 611 and 612 can not press the optical disc 1, but the discguide mechanism 41 (as the second disc feeding mechanism) operates suchthat the optical disc 1 can be completely ejected from the slot 10A.Specifically, the first link 411 is rotated clockwise by biasing forceof the spring, so that the abutting portion 41A presses the peripheralportion of the optical disc 1 to eject the optical disc 1.

Next, with reference to FIGS. 10 to 14, an operation to insert and ejectthe optical disc 1 having a small diameter (8 cm) into and from the discdrive will be described.

When a user manually inserts the optical disc 1 having the smalldiameter from the slot 10A into the disc drive as shown in FIG. 10, theperipheral portion of the optical disc 1 causes a small counterclockwiserotation of the abutting portion 421A of the arm 421 and presses theabutting portion 41A of the disc guide mechanism 41. Thereby, since themovement amount of the connecting member 423 that rotates with the arm421 is small, the projection 52 positioned on the common cam groove 53Cof the first drive cam 44 remains on the second cam groove 53B side.Additionally, since the rotation amount of the connecting member 423 issmall, the movement toward the right side in the figure of theanti-rotation link 424 is extremely small. Accordingly, the stopper 424Aprovided on the left end of the anti-rotation link 424 is positioned onthe movement locus of the pin 411 A of the disc guide mechanism 41 (seeFIGS. 2A and 2B).

As shown in FIG. 11, when the optical disc 1 is further inserted, thedisc guide mechanism 41 is deformed. However, when the pin 411 A abutsto the stopper 424A of the anti-rotation link 424, the deformation ofthe disc guide mechanism 41 will stop. In this state, when the opticaldisc 1 is further inserted, the optical disc 1 abuts to the abuttingportions 61A of the eject arms 611 and 612.

When more than the half of the optical disc 1 has been inserted in thedrive, a switch (not shown) operates in accordance with the rotations ofthe eject arms 611 and 612. In accordance with the operation of theswitch, the disc feeding mechanism 50 operates.

Accordingly, the first drive cam 44 advances and the projection 52 movesalong the second cam groove 53B formed in the first drive cam 44.Thereby, the connecting member 423 provided with the projection 52 makesa large rotation clockwise and accordingly the arm 421 rotates clockwiseto press and insert the optical disc 1 to the turntable 23. Thus, theprojection 52 moves along the second cam groove 53B, the rotation amountof the arm 421 is larger than that of the above-described large opticaldisc 1. As shown in FIG. 12, the arm 421 rotates until the center of theoptical disc 1 is positioned on the turntable 23.

As shown in FIG. 13, when the arm 421 inserts the optical disc 1 to theturntable 23, the projection 52 is guided to the curved portion 53Dformed on the end of the second cam groove 53B and the arm 421 rotatesin the reverse direction, so that the abutting portion 421A is spacedfrom the peripheral portion of the optical disc 1. In addition,similarly to the above description, the eject arms 611 and 612 and thedisc guide mechanism 41 are spaced from the optical disc 1 so as not toprevent the rotation of the optical disc 1.

To eject the optical disc 1 from the disc drive, the first disc feedingmechanism 61 is operated in a similar manner as described above.Specifically, as shown in FIG. 14, the eject arms 611 and 612 arerotated so as to press and eject the peripheral portion of the opticaldisc 1 toward the slot 10A.

After more than substantially the half of the optical disc 1 is ejectedfrom the slot 10A by the eject arms 611 and 612, the eject arms 611 and612 cannot press the optical disc 1. However, since biasing force of thespring rotates the first link 411 of the disc guide mechanism 41clockwise, the abutting portion 41A presses and ejects the peripheralportion of the optical disc 1.

(Effects and Advantages of Disc Drive)

As described above, the present embodiment can provide followingexemplary effects and advantages.

(1) Since the disc drive of the embodiment includes the disc guidemechanism 41 that is provided on one end side of the slot 10A in thedrive unit body 10 and guides the optical disc 1; and the disc diameterdetecting mechanism 42 that is provided on the other end side of theslot 10A in the drive unit body 10 and retracts the disc guide mechanism41 when the optical disc 1 inserted in the slot 10A is large andadvances the disc guide mechanism 41 when the optical disc 1 is small,the optical disc 1 can be centered in accordance with the diameter ofthe optical disc 1 by the disc guide mechanism 41 and the disc diameterdetecting mechanism 42 that are respectively positioned on the sides ofthe slot 10A. Hence, even when a pair of rollers is not provided withthe front and rear surfaces of the optical disc 1 interposed, and evenwhen a switch or the like for judging the diameter of the optical disc 1is not provided, the optical discs 1 having different diameters can beused in a thinned disc drive.

(2) Since the disc guide mechanism 41 is biased toward the advancingdirection, it is not necessary that the drive have a structure forcausing a large movement of the disc guide mechanism 41 when the opticaldisc 1 having a small diameter is inserted. Hence, the structure of thedrive can be simple.

(3) Since, the disc diameter detecting mechanism 42 is provided with thearm 421 of which one end abuts to the optical disc 1 and the other endis rotatable; and the arm link mechanism 422 that is connected with thearm 421 and allows the disc guide mechanism 41 to retract when arotation angle of the arm 421 is large while prevents the disc guidemechanism 41 from retracting when the rotation angle of the arm 421 issmall, the diameter of the optical disc 1 can be judged by the rotationangle of the arm 421, so that the disc guide mechanism 41 can becontrolled by the arm link mechanism 422 based on the judgment. Hence,even when the diameter variation of the optical disc 1 is 3 or more, theoptical disc 1 can be centered in accordance with each diameter.

(4) Since the disc guide mechanisms 41 are positioned apart from eachother with a predetermined distance and one ends of the disc guidemechanisms 41 each have the two first links 411 rotatably supported bythe drive unit body 10 and the second link 412 that connects the otherends of the first links 411 and moves toward and apart from theturntable 23 in accordance with the rotation of the first links 411, theoptical discs 1 having different diameters can be guided by such asimple arrangement of the parallel link.

(5) Since the disc diameter detecting mechanism 42 is provided with theanti-rotation link 424 that prevents the rotation of the first links411, retraction of the disc guide mechanism 41 can be reliably preventedby such a simple arrangement of the anti-rotation link 424.

(6) The abutting portion 41A abutting to the optical disc 1 is providedin the vicinity of the connecting portion of the first links 411 and thesecond link 412. Since the vicinity of the connecting portion of thefirst links 411 and the second link 412 is an area to which the opticaldisc 1 inserted from the slot 10A easily abuts, owing to the abuttingportion 41A provided on this area, the parallel link formed of the firstlinks 411 and the second link 412 can be smoothly deformed, so that thedisc guide mechanism 41 can be reliably operated.

(7) Since the disc guide mechanism 41 and the disc diameter detectingmechanism 42 are adapted to be spaced from the optical disc 1 when theturntable 23 is rotating, the disc guide mechanism 41 and the discdiameter detecting mechanism 42 do not interfere with the optical disc 1when information is recorded on and/or reproduced from the recordingsurface of the optical disc 1.

(8) Since the disc drive is provided with the switch that detects thatthe optical disc 1 has been inserted to a predetermined position fromthe slot 10A; and the arm 421 presses and inserts the optical disc 1toward a rear side in accordance with the detection by the switch, thedisc diameter detecting mechanism 42 can be operated at appropriatetiming.

(9) The arm 421 and the disc guide mechanism 41 are positioned in aplane in which the optical disc 1 is disposed. This arrangement alsocontributes to the downsizing in thickness of the disc drive.

(10) The disc guide mechanism 41, the arm 421, the connecting member 423and the anti-rotation link 424 are disposed so as to enclose theturntable 23. In other words, these components are reasonably positionedin a spatially economical manner. Hence, the downsizing in thickness ofthe disc drive can be achieved.

(11) Since the disc drive of the embodiment is provided with the discfeeding mechanism 50 that is disposed in the drive unit body 10 andfeeds the optical disc 1 inserted in the slot 10A to the turntable 23,the disc feeding mechanism 50 reducing the feeding amount when theoptical disc 1 is large and increasing the feeding amount when theoptical disc 1 is small, the two types of optical discs 1 havingdifferent diameters of 12 cm and 8 cm can be fed from the slot 10A tothe turntable 23. Hence, even when a pair of rollers is not providedwith the front and rear surfaces of the optical disc 1 interposed andeven when a switch or the like for judging the diameter of the opticaldisc 1 is not provided, the optical disc 1 having different diameterscan be fed from the slot 10A to the turntable 23.

(12) The disc feeding mechanism 50 is provided with the arm 421 of whichone end abuts to the optical disc 1 and the other end is rotatable; theconnecting member 423 of which one end is connected with the arm 421;and the first drive cam 44 with which the other end of the connectingmember 423 is connected, the first drive cam 44 advancing andretracting. The connecting member 423 and the first drive cam 44 areeach provided with the disc feeding cam portion 51 that reduces therotation amount of the arm 421 when the optical disc 1 is large andincreases the rotation amount of the arm 421 when the optical disc 1 issmall. The diameter of the optical disc 1 can be judged by the rotationangle of the arm 421. The connecting member 423 and the first drive cam44 are relatively moved by the disc feeding cam portion 51 based on thejudgment. With the arrangement, even when the diameter of the opticaldisc 1 varies, the optical disc 1 can be accurately fed to the turntable23 in accordance with each diameter by such a simple arrangement of theturntable 23.

(13) The disc feeding cam portion 51 is provided with the projection 52provided to the connecting member 423; and the cam groove 53 that isengaged with the projection 52 and formed in the first drive cam 44. Thecam groove 53 includes the first cam groove 53A that feeds the opticaldisc 1 having a large diameter and the second cam groove 53B that feedsthe optical disc 1 having a small diameter. The disc feeding cam portion51 can be formed by providing the plurality of cam grooves to the firstdrive cam 44 and by providing the projection 52 to the connecting member423. With the arrangement, manufacturing cost of the disc feeding camportion 51 can be reduced.

(14) Since the common cam groove 53C is provided to the first drive cam44 at the area on which one ends of the first and second cam grooves 53Aand 53B join together, by engaging the projection 52 with the common camgroove 53C in advance before switching the projection 52 to the firstcam groove 53A or the second cam groove 53B, the switching between thefirst cam groove 53A and the second cam groove 53B can be smooth.

(15) Since the first drive cam 44 also serves as the drive cam thatmoves the turntable 23 toward and away from the optical disc 1, thenumber of components can be reduced, thereby contributing to thedownsizing and cost reduction of the disc drive.

(16) Since the connecting member 423 is formed substantially in a flatplate shape, the downsizing in thickness of the disc drive can beachieved.

(17) Since the projection 423A is provided to the connecting member 423and the guide groove 421B that guides the projection 423A is provided tothe arm 421, the rotation of the arm 421 can be reliably transmitted tothe connecting member 423 by such a simple arrangement of the projection423A and the guide groove 421B.

(18) Since the roller-like abutting portion 421A is provided on the tipend of the arm 421, even if the optical disc 1 is inserted with strongforce from the slot 10A, the abutting portion 421A that abuts to theoptical disc 1 is rotated, thereby preventing damage on the peripheralportion of the optical disc 1.

(19) Since the disc drive of the embodiment is provided with the discejecting mechanism 43 that ejects the optical disc 1 disposed on theturntable 23 to the slot 10A; and the disc ejecting mechanism 43 isprovided with the first disc feeding mechanism 61 positioned on a rearside in the drive unit body 10 and the second disc feeding mechanismthat is positioned on the slot 10A side of the first disc feedingmechanism 61 and feeds the optical disc 1 fed by the first disc feedingmechanism 61 to the slot 10A, the optical disc 1 having a small diametercan be transferred from the turntable 23 to the slot 10A by the firstdisc feeding mechanism 61 and the second disc feeding mechanismrespectively positioned on a rear side and opening side of the slot 10Ain order to eject the optical disc 1 to the outside, so that the opticaldisc 1 can be ejected from the slot 10A to the outside without necessityof providing the pair of rollers provided on the front and rear surfacesides of the optical disc 1 or providing a switch or the like thatjudges the diameter of the optical disc 1.

(20) Since the second disc feeding mechanism also serves as the discguide mechanism 41, the number of components can be reduced, therebycontributing to the downsizing and cost reduction of the disc drive.

(21) Since the first disc feeding mechanism 61 is provided with theeject arms 611 and 612 of which one ends are rotatably supported in thedrive unit body 10 and the other ends abut to the peripheral portion ofthe optical disc 1. Hence, by rotating the one ends of the eject arms611 and 612, the optical disc 1 can be easily fed toward the slot 10A,so that the arrangement of the first disc feeding mechanism 61 can besimple.

(22) Since the roller-like abutting portion 61A that abuts to theperipheral portion of the optical disc 1 is provided on each tip end ofthe eject arms 611 and 612, the abutting portion 421A abutting to theoptical disc 1 is rotated when the optical disc 1 is inserted from theslot 10A, thereby preventing damage on the peripheral portion of theoptical disc 1.

(23) Since the pair of eject arms 611 and 612 is provided with theturntable 23 interposed, force is applied on the right and left sides ofthe optical disc 1, which enables the optical disc 1 to be linearly fedto the slot 10A.

Modifications of Embodiment

The present invention is not limited to the embodiment above, butincludes following exemplary modifications without departing from thescope of the invention.

For example, although the disc guide mechanism 41 is constantly biasedin the advancing direction, a motor and a gear mechanism may be providedsuch that the disc guide mechanism 41 is advanced and retracted.

Although the disc diameter detecting mechanism 42 detects the diameterof the optical disc 1 with the arm 421 of which one end abuts to theoptical disc 1 and the other end is rotatable, the arrangement is notlimited thereto. For example, a rod may be provided along the slot 10Aand advancement and retraction of the rod may be interlocked via a cammechanism or the like.

The disc guide mechanism 41 may not be limited to the parallel linkformed of the two first links 411 and the one second link 412. Coilsprings may be directly connected with the ends of the second link 412.

In the invention, the disc feeding mechanism 50 and the disc ejectingmechanism 43 may not be provided. Even when the disc ejecting mechanism43 is provided, another arrangement may be employed in which the discguide mechanism 41 and the second disc feeding mechanism areindividually provided.

As the optical discs 1 having different diameters, the two types of 8 cmand 12 cm have been exemplified, three or more diameter types of opticaldisc 1 may be handled.

In addition to the above examples, the arrangements or the procedure forimplementing the present invention may be changed as long as an objectof the invention can be achieved.

Effects and Advantages of Embodiment

As stated above, since the disc drive is provided with the drive unitbody 10 including the slot 10A that allows insertion and ejection of theoptical disc 1; the turntable 23 that is provided in the drive unit body10 and rotates the optical disc 1; the disc guide mechanism 41 that isprovided on the one end side of the slot 10A in the drive unit body 10and guides the optical disc 1; and the disc diameter detecting mechanism42 that is provided on the other end side of the slot 10A in the driveunit body 10 and retracts the disc guide mechanism 41 when the opticaldisc 1 inserted in the slot 10A is large and advances the disc guidemechanism 41 when the optical disc 1 is small, the optical disc 1 can becentered in accordance with the diameter thereof by the disc guidemechanism 41 and the disc diameter detecting mechanism 42 respectivelypositioned on the ends of the slot 10A. Hence, even when a pair ofrollers is not provided with the front and rear surfaces of the opticaldisc 1 interposed, and even when a switch or the like for judging thediameter of the optical disc 1 is not provided, the disc drive canhandle optical discs 1 having different diameters.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a recording medium drive equippedwith a slot that is provided to a drive unit body and allows insertionand ejection of a disc-like recording medium; and a driving section thatis provided substantially at a center portion in the drive unit body androtates the disc-like recording medium.

1. A recording medium drive, comprising: a drive unit body having a slotfor allowing insertion and ejection of a disc-like recording medium; adriving portion that is provided in the drive unit body and rotates thedisc-like recording medium; a disc guide mechanism that is provided onone end side of the slot and guides the disc-like recording medium; anda disc diameter detecting mechanism that is connected with the discguide mechanism and moves the disc guide mechanism in accordance with adiameter of the disc-like recording medium, wherein the disc guidemechanism is disposed on the one end side of the slot and biased towardthe opposite end side, and the disc diameter detecting mechanismretracts the disc guide mechanism toward the one end side when thedisc-like recording medium having a large diameter is inserted in theslot.
 2. The recording medium drive according to claim 1, wherein thedisc diameter detecting mechanism is proved with an arm of which one endabuts to the disc-like recording medium and the other end is rotatable;and an aim link mechanism that is connected with the arm and allowsmovement of the disc guide mechanism when the inserted disc-likerecording medium has a large diameter and prevents movement of the discguide mechanism when the inserted disc-like recording medium has a smalldiameter.
 3. The recording medium drive according to claim 1, whereinthe disc guide mechanism is provided with first links that arepositioned with a predetermined distance therebetween, one end of eachfirst link rotatably supported by the drive unit body; and a second linkthat connects the other ends of the first links and moves toward andaway from the driving portion in accordance with rotation of the firstlinks.
 4. The recording medium drive according to claim 3, wherein thedisc diameter detecting mechanism is provided with an anti-rotation linkthat prevents the rotation of the first links.
 5. The recording mediumdrive according to claim 3, further comprising: an abutting portion thatis provided in the vicinity of a connecting portion of the first linksand the second link and abuts to the disc-like recording medium.
 6. Therecording medium drive according to claim 1, wherein the disc guidemechanism and the disc diameter detecting mechanism are spaced from thedisc-like recording medium when the driving portion is driving.
 7. Therecording medium drive according to claim 2, further comprising: aswitch that detects that the disc-like recording medium is inserted fromthe slot to a predetermined position, wherein the disc diameterdetecting mechanism presses the disc-like recording medium toward thedriving portion by the arm when the switch detects that the disc-likerecording medium is inserted to the predetermined position.
 8. Therecording medium drive according to claim 2, wherein the arm and thedisc guide mechanism are disposed in a plane in which the disc-likerecording medium is disposed.